基于Lagrange插直算法的合并单元校准方法

摘要

由于通过传统模拟交流量接口或交流模拟小信号接口采集的模拟信号会因为测量电路中存在非线性元件产生相位误差和幅值误差,而不能向后级测控保护装置提供准确可靠的测控保护信息,为解决该问题,提出了在合并单元向间隔层发送采集的数据之前,使用基于拉格朗日插值的软件校准方法进行相位和幅度补偿校准处理,并进行了必要的误差分析.实例仿真结果表明,它克服了传统硬件电路校准时过程繁琐,难以满足测量要求的缺陷,该算法过程简单,易于实现,准确性高.%To solve the problem that through the amount of traditional analog communication interface or exchange of small analog signal interface, the analog signal will generate phase error and magnitude error, because of the nonlinear elements in the measurement circuit and can not provide accurate and reliable information on monitoring and protection for backward-level protection devices. The software calibration method based on Lagrange interpolation algorithm for phase and magnitude is proposed before the merging unit send the data to interval level. And the necessary error analysis is made. Results of the simulation indicate the proposed method that it overcomes the defect that the traditional hardware calibration process cumbersome, difficult to meet the measurement requirements. The process of software calibration method based on Lagrange interpolation algorithm is simple, easy to implement and has high accuracy.